Pressure-controlled cut-off



' IVI. L. DAVIS AND G. W. COOK.

PRESSURE CONTRLLED CUT-OFF.

" APPLICATION FILED FEB. 6, 1920.

sssssmNSSs .m m ...............IIII......NH

lnIIIrIIILllL lllllll I WITNESSES NI. L. DAVIS AND G. W. COOK.

PRESSURE CONTROLLI-ID CUT-OFF.

APPLICATION FILED FLB. 6,1920.

Patented July 18, 1922.

2 SHEETS-SHEET 2.

@ZbW

/m/E/v TUR Meh/ln L. Dar/s.

WITNESSES A TTRNEYS Umm@ r TENT @IFP f MELVIN L. DAVIS AND GLEN W. COOK, OF ENID, OKLAHOMA, ASSIG-NOBS OF ,ONE- THIRD TO HERBERT H. CHAMPILIN, OF ENID, OKLAHOMA.

rianssunnwconrnotrnn curorr.

Lanai-oa,

Specification ef Lettersatent.

Patented July i8, 1.92.2.

Application ,filled February 46, lSerial litro. 356,775.

To @ZZ whom t may concerti.'

States; and residents Vof Enid, in the ceunty of Garfield and State of GRlahQina, have invented certain new and useftul Improvements in Pressure-Controlled Cut-(Offs, of Vwhich the following is ,a specification.

` Our invention relates to improvements in automatic cut-offs, and it consists in the constructions, comhina-tions zand arrangements hereinY described and claimed. I A

One of the foremost1 objects of our inven; tion is to provide aV cut-off adapted more particularly for use in connection gas stoves, gas-iigliting systems .and the like, aiitematialv Cutting .Off th .HOW 0f' ses when it falls below a predetermined pressure, and becoming locked `in the cut oli position so as ,to temporarily prevent the `gas from iiowing into lthe pipesof the stove or lighting system when Ethe pressure returns.k

A further object of our .invention is to provideautomatic cut-olimeans for use connection with gas lighting systems, to pre-V vent the asphyxiation of persons in dwelling under the circumstance .of the vfall of pressure to `a predetermined low point at which :the lights go out, and the consequent escape ot gas into the room upon .the return of the pressure. f y

A further object oit the invention is kto provide novel locking means to be used in connection with a cut-oit of the character described, whichprevents the raising of a certain gas valve when the pressure returns after having fallen below a predetermined lowvpoint.

A further objecto't the invention is to provide an automatic cut-offici gas ,lighting systems, gasheating systems, etc., which will positively prevent/explosions in cases where a match is struck'after a tallot the gas pressure 'and the consequent escape lof some of the fumes into the rooms ofa dwelling. l

Other objects and advantages vwill appear in the following specification, `reference being ,had to the ,acempanrve drawings, ,ir whichz` Figure l is a central longitudinal section through the casing of the 4cut-off, illustrating the main valve in the open position vas when the gasiiows under normalv'pres'sure,

Figure is a plan view .ot the cut-off mechanism, the casing` being shown in sec'- ton. c. Y, c

liggaire 3 is a detail cross sectiontaken substantially on the line 3 3 of Figure l,

Figure l is afdetail cross section taken substantially on the line 4 4 of FigureQ, but illustrating the locking mechanism en-` gaged as when the main valvev` has fallento the dotted line closed position under 'a reductionof gas pressure, l

Figure 5V 1s a. similar View illustrating how the cam operates to lift 'the dog when the main valve is again lifted 'by'manually turning the crank on the outside,l

Figure 6 isa horizontal section taken substantially ontheline 6-6 of Figure,

`Figure `7 a slight modification of the gas inlet tube, illustratingthe 'use ofaglass or other non-corrosive bushing to prevent stickingo'f the inletplunger valve, and

Figiire'S is a further modification in the construction of theV gas inlettube, adapted for the same purpose.

Invcarryingout our invention we provide a gas-tight casing l whichhas gas inlet and outlet pipes 2, 3. These pipes are respectively connected tothe source ofgas 'supply and to the connection which leads to =the meter, in kother words, this improved gas cut-on' is disposed between the gas'supply and the device with which it is to be used in y connection `as tor example, a lighting system or a gas stove, so that when the 'pressure of thefgas in the mainv falls below :a predetermined point, the liow or communication is entirely cut o ii land can be resumed yonly bymanual operation ofthe cut-oliy at a later time. c

Assume the mechanism ,to be in theposition when gas is iiowing undernorinal pressure. The primary valveor plungerl-*in i.

the inlet pipe 2 will then bein the Aposition in Figure il, at which time the portsy 5, .6 yare in registrationfandgas flows into the casing l, aslindicated by the arrow.V Under such circumstances, the main valve 7 is in the full line position, so that the gas can in turn lll flow into the throat 8 of the outlet pipe 3, and from there into the stove, lighting system, etc. y

A rack 9, in extension of the plunger or primary valve 4, meshes with a gear 10 mounted on a counter-shaft 11 between the sides of the frame 12. `itin idler 13 connects the gear 10 with the gear segment 14 of the valve stem 15, to the extremity of which the inain valve 7 is pivotally mounted as shown. Tlieaxial mounting 16 of the valve stem 15 is altogether independent of the manual revoluble or re-setting shaft 17 which appears directly below the axis 16. Y Y

The smooth e portion of the rack 9V extends into the cylinderr18, where it is provided with a piston 19against which the spring 2O presses. The tension of the spring 20 is adjustable by means of the follower 21 and set screw 22. Guide means 23 is also employed iii connection with the rack and piston 19, such guide means being ,solely for the purpose of preventing tui-ning of the valve l and consequent distortion of the position of the rack 9. U

When the pressurek of the gas against the plunger or valve f1 reaches a predetermined ow point, the spring 20 shifts all of the connected parts toward the left so that the ports 5, ,6 are moved out of registration and the flow of gas into the vcasing 1, stopped. The same movement of the valve 1 effects the main valve 7` which is thus caused to `move into the dotted line position in` Figure 1, by `virtue of the operation of the train of gears` illustrated.l The valve 7 seats itself upon the rubber bushing 211 so that gastight joint is made and no gas canY escape into the outlet pipe.

Now consider Figure e. The turning of the gear 10 in the clockwise direction ofthe arrow a in Figure d, causeswthegear `2.5 on the shaft 11 to turn in the samedirection, because it is Afixed on the shaft, thereby causing the gear 26, loose on there-setting shaft 17, to move in the counter-clockwise directionA of the arrow bin Figure Ll: and cause the locking notch 2T of the locking boss 28 to move beneath the heel `of the deg 29 and thus prevent counter rotation ofthe gear train by the return ofthe gas pressure against the head of the` primary inlet valve l.

The dogl 29 loosely -inounted on the counter shaft 11, Vand the "end thereof ,falls into the lockingnotch 2T by gravity. lt is now absolutely impossible for gas toenter the outletl pipe 3 from tliecasing 1, because the main valve 7 is firmly seated on the bushing 24;, and is furthermore locked in this pesition by reason of' ther engagement ofther dog 29 with the locking boss 28. The

`17 is vloosely mounted between the frame 12 and the packing gland 33 where the shaft passes through the casing. It has been explained that the gear 26 is loose on this shaft, and it naturally follows that the rotation of the shaft, as just explained, has no turning effect on the gear 26, untilthe finger 311 engages the lug 35 on the gear 26, `whereuponl continued rotation of the shaft causes4` the rotation ofthe gear in the direction counter to the arrow b in Figure 4.

rlhe cam 32 overlaps the locking boss 28 of the gear 26, so as to easily come beneath thefdog 29. This is illustrated in l 1 .igui'e G. Access to the interior V,of the `casing 1 for purposes of inspection and repairs, is had` through. the removable cover plate 36 at one side'. y l

K This plate` is secured by thumb screws 3T, which Awhen screwed down, firmly bind the periphery of the plate 36 against a suitablebushing or packing 38 around the opening. It is to be observed that there is room for considerable modificationsl so far` as' the means of mounting the pla-te 36 is concerned. rlhe construction and shape of the causing 1 is also subject to consideiable moditicatien, because obviously, these will be such as to more conveniently pactice.

f lt should also be observed that there is a spring connection 39 `between the resetting` This spring op-f shaft 1T, and the frame 12. erates to keep the shaft 1T in a normal posiadapt the device to actual p.

tion at whichl time the crank 30cm the out-` l i side will preferably extend downwardly.

Attention is now directedto Figures T und 8. ln Figure 7the inlet pipe 2d has a bushiiig'l@ of glass vor other*non-corrosive material, for the purpose of overii'oiniiig the Vdanger of the primary valve #sticking by a possible accumulation of sediment such 'as might occur in cases where the valves have no occasions to close for aV longtime) The glass bushing` e()V will prevent rusting of the tube 2, l. l

The form in Figure 8 is eveiixbetter 'adapt-` ed to thelprevention of thefoperation of theA Talve 41 by the `accumulation of sediment in front of it. Here the inlet tube or pipe 2" is counter-bored at 41 4so to provide an:

annular space into whichthefvalvc 1b prof; jects. The resultant shoulder is considerf ably'higher than an accumulation of sedithis means, is entirely obviated.

YWe claim 'LA cut-off, comprising a ported fluid inlet pipe, with a ported primary valve in normal registration therewith; tension-oper ated means opposing the fluid vpressure against said valve but normally neutralized thereby, a fluid outlet pipe, and means operatively associated with a part of the primary valve, including a main valve for closing the outlet pipe by the influence of said tension means on the primary valve when the fluid pressure reaches a predetermined low point.

2. A. cut-off, comprising a ported fluid inlet pipe, with a ported primary valve in normal registration therewith; tensioiroperated means opposing the fluid pressure against said valve but normally neutralized thereby, a fluid outlet pipe, means operatively associated with a part of the primaryvalve, includingA a main valve for closing the outlet pipe by the influence of said tension means on the primary valve when the fluid pressure reaches a predetermined low point, and means associated with said last named means for locking it and said main valve in the closed position and preventing the re-opening of the primary valve by `the return of the fluid pressure.

3. Means for automatically cutting off the flow of gas when the pressure falls below a predetermined point, comprising a primary inlet valve held open by normal gas pressure,

a gear train operatively combined therewith, f

a closure valve for an outlet pipe, normally standing open but moved to the closing position by operation of the gear train when the primary valve closes upon fall of the sustaining gas pressure, and means operatively associated with said gear train for locking the closure valve, including a locking disk and a gravity actuated dog.

il. An automatic gas cut-off including a primary inlet valve and a main outlet valve, with intermediate gear connections; and ai manual re-setting shaft on which one of the gears is loosely mounted, with a cam for initially raising a dog in locking engagement with a netch in a boss on said gear, and a finger for subsequently engaging a lug on said gear to obtain counter-rotation of the gear connection by continued turning of said shaft, and consequent 17e-opening of the primary and main valves.

5. An automatic gas cut-off, comprising a casing with ported inlet pipe and an outlet pipe, an intermediate ktrain having a court tersshaft mounted gear engaging a rack on a ported primary valve in ythe inlet, said rack having a piston in a cylinder which is engaged by an adjustable spring opposing fluid under normal pressure, a valve stem, with a gear segment engagingan idler meshing with the first gear, including a valve normally raisedfrom the ported outlet; and .lockingd apparatus including a re-setting shaft with a crank on the end exposed beyond the casing, with av cam for initially raising a dog when occupying a locking position inthe notch of a boss on a gear kloose on the re-setting shaft, said gear meshing with a similar gear on the aforesaid counter-- shaft, and a finger on the re-setting shaft subsequently engaging a lug on said loose gear to enable counter-turning of the gear train to re-open both valves after they have moved to a closed position by the operation of the spring upon fall of the gas pressure.

6. An automatic cut-off, comprising inlet and outlet pipes, means exerting influence in line with reciprocating closure means assorciated with one pipe in opposition to fluid pressure thereagainst, and means revolved by the reciprocation of said closure means to in turn oscillate closure means of the other pipe into positions corresponding with those of the first closure means.

7. fn an automatic out -off, revoluble means associated with two closure means, one reciprocable the other oscillatable, whereby both operate simultaneously ac cording to their kinds of movement; rocking means entering a locking engagement with a part of said associated means when the closure means assume predetermined positions, and revoluble means for releasing said locking means.

8. In an automatic cut-oli", revoluble means associated with two closure means, one reciprocable the other oscillatable, whereby both operate simultaneously according to their kinds of movement; rocking means entering a locking engagement with a part of said associated means When the closure means assume predetermined positions, and means for releasing said locking means and operating said revoluble means to re-open the closure means, including an actuating element primarily engaging the locking means, and members subsequently engaging for the operation of said revoluble means.

9. In a cut-off, means exerting pressure against a valve which opposes fluid in an inlet, and gears, including` a segment which carries a main outlet valve, operated to close an outlet by the closure of the inlet valve, and vice versa.

10. In a cut-oft, means exerting pressure on an inlet valve which carries a rack, and

of the valve and consequent distortion of the position of the rack in respect to a gear which operates a main valve.

13. In a eut-ofi', an inlet valve having a rack, sliclv to e closed position by tension means which exerts pressure on a piston on the rack, and guide means carried by the piston, contacting the rack to prevent its turning in respect to a. gear which operates a main valve.

MELVN L. DAVIS. GLEN W. COOK` 

